Wide-band Simultaneous Observations of Pulsars: Disentangling Dispersion Measure and Profile Variations
T. E. Hassall
(1)
,
B. W. Stappers
(1)
,
J. W. T. Hessels
(2)
,
M. Kramer
(1, 3)
,
A. Alexov
(2)
,
K. Anderson
(2)
,
T. Coenen
(2)
,
A. Karastergiou
(4)
,
E. F. Keane
(3)
,
V. I. Kondratiev
(2)
,
K. Lazaridis
(3)
,
J. van Leeuwen
(2)
,
A. Noutsos
(3)
,
M. Serylak
(5, 6)
,
C. Sobey
(3)
,
J. P. W. Verbiest
(3)
,
P. Weltevrede
(1)
,
K. Zagkouris
(4)
,
R. Fender
(7)
,
R. A. M. J. Wijers
(8)
,
L. Bahren
(8)
,
M. E. Bell
(7)
,
J. W. Broderick
(7)
,
Stéphane Corbel
(9)
,
E. J. Daw
(10)
,
V. S. Dhillon
(10)
,
J. Eisloffel
(11)
,
H. Falcke
(3)
,
Jean-Mathias Griessmeier
(6)
,
P. Jonker
(12)
,
C. Law
(8)
,
S. Markoff
(8)
,
J. C. A. Miller-Jones
(8)
,
R. Osten
(13)
,
E. Rol
(8)
,
A. M. M. Scaife
(14)
,
B. Scheers
(8)
,
P. Schellart
(12)
,
H. Spreeuw
(8)
,
J. Swinbank
(8)
,
S. ter Veen
(12)
,
M. W. Wise
(2, 8)
,
R. Wijnands
(8)
,
O. Wucknitz
(15)
,
P. Zarka
(16)
,
A. Asgekar
(2)
,
M. R. Bell
(17)
,
M. J. Bentum
(2)
,
G. Bernardi
(18)
,
P. Best
(19)
,
A. Bonafede
(20)
,
A. J. Boonstra
(2)
,
M. Brentjens
(2)
,
W. N. Brouw
(21)
,
M. Bruggen
(20)
,
H. R. Butcher
(2)
,
B. Ciardi
(17)
,
M. A. Garrett
(2, 22)
,
M. Gerbers
(2)
,
A. W. Gunst
(2)
,
M. P. van Haarlem
(2)
,
G. Heald
(2)
,
M. Hoeft
(11)
,
H. Holties
(2)
,
A. de Jong
(2)
,
L. V. E. Koopmans
(21)
,
M. Kuniyoshi
(3)
,
G. Kuper
(2)
,
G. M. Loose
(2)
,
P. Maat
(2)
,
J. Masters
(23)
,
J. P. Mckean
(2)
,
H. Meulman
(2)
,
M. Mevius
(2)
,
H. Munk
(2)
,
J. E. Noordam
(2)
,
E. Orru
(24)
,
H. Paas
(2)
,
M. Pandey-Pommier
(25)
,
V. N. Pandey
(2)
,
R. Pizzo
(2)
,
A. Polatidis
(2)
,
W. Reich
(3)
,
H. Rottgering
(22)
,
J. Sluman
(2)
,
M. Steinmetz
(26)
,
C. G. M. Sterks
(27)
,
Michel Tagger
(6)
,
Y. Tang
(2)
,
C. Tasse
(16)
,
R. Vermeulen
(2)
,
R. J. van Weeren
(2)
,
S. J. Wijnholds
(2)
,
S. Yatawatta
(21)
1
Jodrell Bank Centre for Astrophysics
2 ASTRON - Netherlands Institute for Radio Astronomy
3 MPIFR - Max-Planck-Institut für Radioastronomie
4 Oxford Astrophysics
5 USN - Unité Scientifique de la Station de Nançay
6 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
7 University of Southampton
8 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
9 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
10 University of Sheffield [Sheffield]
11 TLS - Thüringer Landessternwarte Tautenburg
12 IMAPP - Institute for Mathematics, Astrophysics and Particle Physics
13 STSci - Space Telescope Science Institute
14 School of Physics and Astronomy [Southampton]
15 AlfA - Argelander-Institut für Astronomie
16 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
17 Max Planck Institute for Astrophysics
18 CfA - Harvard-Smithsonian Center for Astrophysics
19 Edin. - University of Edinburgh
20 Jacobs University = Constructor University [Bremen]
21 Kapteyn Astronomical Institute [Groningen]
22 Leiden Observatory [Leiden]
23 NRAO - National Radio Astronomy Observatory
24 IMAPP - Applied Stochastics
25 CRAL - Centre de Recherche Astrophysique de Lyon
26 DSMZ - Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH / Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures
27 Center for Information Technology CIT
2 ASTRON - Netherlands Institute for Radio Astronomy
3 MPIFR - Max-Planck-Institut für Radioastronomie
4 Oxford Astrophysics
5 USN - Unité Scientifique de la Station de Nançay
6 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
7 University of Southampton
8 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
9 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
10 University of Sheffield [Sheffield]
11 TLS - Thüringer Landessternwarte Tautenburg
12 IMAPP - Institute for Mathematics, Astrophysics and Particle Physics
13 STSci - Space Telescope Science Institute
14 School of Physics and Astronomy [Southampton]
15 AlfA - Argelander-Institut für Astronomie
16 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
17 Max Planck Institute for Astrophysics
18 CfA - Harvard-Smithsonian Center for Astrophysics
19 Edin. - University of Edinburgh
20 Jacobs University = Constructor University [Bremen]
21 Kapteyn Astronomical Institute [Groningen]
22 Leiden Observatory [Leiden]
23 NRAO - National Radio Astronomy Observatory
24 IMAPP - Applied Stochastics
25 CRAL - Centre de Recherche Astrophysique de Lyon
26 DSMZ - Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH / Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures
27 Center for Information Technology CIT
Jean-Mathias Griessmeier
- Function : Author
- PersonId : 737206
- IdHAL : jean-mathias-griessmeier
- ORCID : 0000-0003-3362-7996
- IdRef : 235780871
P. Zarka
- Function : Author
- PersonId : 755767
- ORCID : 0000-0003-1672-9878
- IdRef : 034944648
A. Bonafede
- Function : Author
- PersonId : 766668
- ORCID : 0000-0002-5068-4581
R. Pizzo
- Function : Author
- PersonId : 766670
- ORCID : 0000-0003-2816-9492
Michel Tagger
- Function : Author
- PersonId : 4538
- IdHAL : michel-tagger
- ORCID : 0000-0003-2962-3220
- IdRef : 097156310
Abstract
Dispersion in the interstellar medium is a well known phenomenon that follows a simple relationship, which has been used to predict the time delay of dispersed radio pulses since the late 1960s. We performed wide-band simultaneous observations of four pulsars with LOFAR (at 40-190 MHz), the 76-m Lovell Telescope (at 1400 MHz) and the Effelsberg 100-m Telescope (at 8000 MHz) to test the accuracy of the dispersion law over a broad frequency range. In this paper we present the results of these observations which show that the dispersion law is accurate to better than 1 part in 100000 across our observing band. We use this fact to constrain some of the properties of the ISM along the line-of-sight and use the lack of any aberration or retardation effects to determine upper limits on emission heights in the pulsar magnetosphere. We also discuss the effect of pulse profile evolution on our observations, and the implications that it could have for precision pulsar timing projects such as the detection of gravitational waves with pulsar timing arrays.
Origin | Publisher files allowed on an open archive |
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